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Signed-off-by: Helge Deller <deller@gmx.de>
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Use a macro to define and obtain the value of a symbol introduced by
the linker scripts (scripts/layoutrom.py).
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Consistently use 'u32' for physical addresses and pointers for virtual
addresses in the malloc code. Introduce and use memremap() where a
physical address needs to be converted to a virtual address. Use
virt_to_phys() for the inverse.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Move PAGE_SHIFT / virt_to_phys() to memmap.h and smp_[rw]mb() to
x86.h.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Rename memmap.c to e820map.c as the code in that file only deals with
maintaining the e820 map. Move all the e820 definitions to new file
e820map.h and use a consistent "e820_" prefix on all exported
functions.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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The E820_HOLE definition is used internally in the e820 manipulation
code to remove entries from the e820 map. Introduce the e820_remove()
function so that the E820_HOLE definition does not need to be exported
from the memmap.c code.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Convert all users of the alternative variable exports to VARFSEG.
There isn't a significant distinction between the existing types of
exports, so it's simpler to just use one type going forward.
The new VARFSEG declaration is only emitting when in 32bit mode, so
update and move some variables as needed.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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The POST phase has to invoke many initialization functions, and these
functions can have complex inter-dependencies. Try to categorize the
functions into 4 classes:
preinit - functions called very early in POST where function ordering
is very important and the code has limited access to other
interfaces.
init - functions that initialize internal interfaces and standard
external interfaces. This code is generally not dependent on
particular hardware and typically does not communicate directly
with any hardware devices.
setup - functions which access hardware or are dependent on particular
hardware or platform devices.
prepboot - functions that finalize internal interfaces and that
prepare for the boot phase.
This patch attempts to normalize the suffixes - functions that used
_init(), _setup(), _finalize(), or similar that did not follow the
above pattern were renamed. Other than function name changes, there
should be no code impact to this patch.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Now that a soft-reboot forces a hard-reboot, it is no longer necessary
to manually reset global variables.
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The existing malloc implementation effectively uses a stack - all new
allocations come from the top of the stack. When allocating memory
with a large alignment, the pad used to align the new memory is
unavailable to other users. Also, memory released by calling free()
is only available to other users when all memory allocated after it is
also freed.
This new malloc scheme uses a first fit approach to finding available
memory. It makes it possible to use alignment padding and freed space
for new allocations.
This helps reduce the required memory in the permanent memory zones
(ZoneHigh and ZoneLow) where users have the need to allocate
structures with high alignment (eg, virtio and usb).
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Omitting "void" leads to a K&R style declaration which was not intended.
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Fix bug where zones over 2gig may fail to allocate.
Add memalign_high() and use for acpi facs allocation.
Misc code cleanups.
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Add new "ramdisk" type for disk accesses.
Extract out high-mem finding code from pmm into find_high_area().
Fix bug in GDB_BASE and GDT_LIMIT macros (wrong bit shifts).
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Complete the initial implementation of PMM.
Default new PMM code to be enabled.
Move malloc code from memmap.c to pmm.c.
Define new malloc zones for PMM (ZoneTmpLow and ZoneTmpHigh).
Change default READ/WRITE_SEG macros to use 32bit pointers (the 16bit
PMM code use "big real" mode and requires 32bit accesses).
Allow pmm allocations to occur during bcv executions also.
Add low-memory clearing before boot.
Also, align the default f-seg memory.
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Add malloc like functions for memory management instead of open-coding
memory reservation in all callers.
Add ability for unused high ram to be returned for general purpose use.
Break up acpi table creation into multiple functions.
Also, move smbios tables into high ram (instead of f-segment).
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Define the e820list as a regular array.
Define a buffer for run-time built bios tables.
Reserving the space in advance should help prevent run-time errors
when space becomes tight.
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Allocate the e820 map space in the 0xf0000 segment and do all updates
in place. This reduces the need to access external memory during
post.
Also, move e820 pointer and count from ebda to variables in 0xf0000.
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Declaring memory between 0xa0000 - 0x10000 confuses windows, so don't
do that.
Add capability to remove mappings in the memory mapping code.
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